import os
from contextlib import asynccontextmanager
from urllib.parse import urlparse

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from app.admin_role_service import bootstrap_super_admin
from app.admin_router import router as admin_router
from app.routers.auth import router as auth_router
from app.routers.auto_login import router as auto_login_router
from app.routers.broker import router as broker_router
from app.routers.health import router as health_router
from app.routers.paper import router as paper_router
from app.routers.password_reset import router as password_reset_router
from app.routers.strategy import router as strategy_router
from app.routers.support_ticket import router as support_ticket_router
from app.routers.system import router as system_router
from app.routers.zerodha import router as zerodha_router, public_router as zerodha_public_router
from app.services.db import _db_config as _validate_db_config
from app.services.auto_login_service import start_auto_login_scheduler
from app.services.live_equity_service import start_live_equity_snapshot_daemon
from app.services.strategy_service import init_log_state, resume_running_runs
from market import router as market_router
from paper_mtm import router as paper_mtm_router

DEFAULT_PRODUCTION_ORIGINS = {"https://app.quantfortune.com"}
DEFAULT_DEV_ORIGINS = {
    "http://localhost:3000",
    "http://127.0.0.1:3000",
    "http://localhost:5173",
    "http://127.0.0.1:5173",
    "https://app.quantfortune.com"
}
PRODUCTION_ENV_NAMES = {"prod", "production"}


def _environment_name() -> str:
    return (
        os.getenv("APP_ENV")
        or os.getenv("ENVIRONMENT")
        or os.getenv("FASTAPI_ENV")
        or "development"
    ).strip().lower()


def _normalize_origin(origin: str) -> str:
    return origin.strip().rstrip("/")


def _is_dev_origin(origin: str) -> bool:
    parsed = urlparse(origin)
    return parsed.scheme == "http" and parsed.hostname in {"localhost", "127.0.0.1"}


def _validate_cors_origin(origin: str) -> str:
    normalized = _normalize_origin(origin)
    if not normalized:
        raise RuntimeError("Empty CORS origin is not allowed")
    if normalized in DEFAULT_PRODUCTION_ORIGINS or _is_dev_origin(normalized):
        return normalized
    raise RuntimeError(
        f"Unsupported CORS origin '{normalized}'. Only app.quantfortune.com and localhost dev origins are allowed."
    )


def _build_cors_origins() -> list[str]:
    configured = [
        _normalize_origin(origin)
        for origin in os.getenv("CORS_ORIGINS", "").split(",")
        if origin.strip()
    ]
    env_name = _environment_name()

    if env_name in PRODUCTION_ENV_NAMES:
        if not configured:
            raise RuntimeError("CORS_ORIGINS must be configured explicitly in production")
        origins = configured
    else:
        origins = configured or sorted(DEFAULT_DEV_ORIGINS)

    deduped: list[str] = []
    seen: set[str] = set()
    for origin in origins:
        validated = _validate_cors_origin(origin)
        if validated not in seen:
            seen.add(validated)
            deduped.append(validated)
    return deduped


def _validate_runtime_secrets():
    env_name = _environment_name()
    if env_name not in PRODUCTION_ENV_NAMES:
        return
    broker_token_key = (os.getenv("BROKER_TOKEN_KEY") or "").strip()
    if not broker_token_key:
        raise RuntimeError("BROKER_TOKEN_KEY must be configured in production")
    if (os.getenv("ENABLE_SUPER_ADMIN_BOOTSTRAP") or "").strip() in {"1", "true", "yes"}:
        if not (os.getenv("SUPER_ADMIN_EMAIL") or "").strip():
            raise RuntimeError("SUPER_ADMIN_EMAIL must be configured when bootstrap is enabled")
        if not (os.getenv("SUPER_ADMIN_PASSWORD") or "").strip():
            raise RuntimeError("SUPER_ADMIN_PASSWORD must be configured when bootstrap is enabled")


def _initialize_app_state(app: FastAPI):
    app.state.startup_complete = False
    app.state.startup_error = None
    app.state.startup_started = False
    app.state.background_warnings = {}


def _run_startup_tasks(app: FastAPI):
    if os.getenv("DISABLE_STARTUP_TASKS", "0") == "1":
        app.state.startup_started = True
        app.state.startup_complete = True
        app.state.startup_error = None
        return

    app.state.startup_started = True
    app.state.startup_complete = False
    app.state.startup_error = None
    try:
        init_log_state()
        bootstrap_super_admin()
        resume_running_runs()
        app.state.startup_complete = True
    except Exception as exc:
        app.state.startup_error = str(exc)
        print(f"[STARTUP] critical startup task failed: {exc}", flush=True)

    try:
        start_live_equity_snapshot_daemon()
    except Exception as exc:
        app.state.background_warnings["live_equity_snapshot_daemon"] = str(exc)
        print(f"[STARTUP] live equity snapshot daemon failed to start: {exc}", flush=True)

    try:
        start_auto_login_scheduler()
    except Exception as exc:
        app.state.background_warnings["auto_login_scheduler"] = str(exc)
        print(f"[STARTUP] auto-login scheduler failed to start: {exc}", flush=True)


@asynccontextmanager
async def _lifespan(app: FastAPI):
    _initialize_app_state(app)
    _run_startup_tasks(app)
    yield


def create_app() -> FastAPI:
    _validate_db_config()
    _validate_runtime_secrets()
    app = FastAPI(title="QuantFortune Backend", version="1.0", lifespan=_lifespan)
    cors_origins = _build_cors_origins()
    app.add_middleware(
        CORSMiddleware,
        allow_origins=cors_origins,
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    app.include_router(auto_login_router)
    app.include_router(strategy_router)
    app.include_router(auth_router)
    app.include_router(broker_router)
    app.include_router(zerodha_router)
    app.include_router(zerodha_public_router)
    app.include_router(paper_router)
    app.include_router(market_router)
    app.include_router(paper_mtm_router)
    app.include_router(health_router)
    app.include_router(system_router)
    app.include_router(admin_router)
    app.include_router(support_ticket_router)
    app.include_router(password_reset_router)

    return app


app = create_app()